Wa'alaikum assalam! Ah, yang hardening tu memang Braxton Hicks lah, practice contractions yang totally normal, especially dari 20 weeks onwards tapi lebih obvious dekat trimester 3 macam sekarang. A few of my mum friends pun ada cerita yang sama, perut mengeras-mengeras tapi nothing else happens, so don't worry! Bedanya dengan actual labour contractions, Braxton Hicks biasanya irregular, xde pain, and hilang kalau you rest or drink water. Tapi sebab first pregnancy, best jugak mention to your gynae next visit just for peace of mind, they can confirm everything's fine with you and baby!